Temperature Effect Study On Cable-Stayed Bridge With High-Pier & Multi-Pylon

It is introduced firstly in this article that development of cable-stayed bridge and structural behaviour of high-pier&multi-pylon cable-stayed bridge, and also is summarized many kinds of method to solve concrete box-girder secion temperature field, especially finite-element method. With the simulation analysis of finite element software such as ANSYS, the most harmful temperature gradient graph can be getted. Then as a background of Chi Shi Bridge in HuNan ChongZhou, after having built the full three-dimensional bridge model with finite element software such as Midas/Civil, it is analysized respectively that the main gird's effect action impacted by the system total temperature difference, main gird temperature gradient, temperature difference between cables, main gird and pylons. The main research content and conclusion are as follows:1. Using the meteorological data from the weather observatory and the local latitude-longitude,the geometric parameters of the main girder itself to calculate the thermodynamic parameters of girder.2. With the use of finite element software ANSYS, the paper has instantaneous temperature field in Time-procedure analysis. And has the conclusions that the most harmful temp-load appears on 15:00, with plus temperature difference curve Tv=13.2e-5.21y and minus temperature difference curve T1=-2.0e-5.42y.3. Intensity of solar radiation,daily maximum temperature and the shape of stem axillary are important factors to affect the temperature gradients of the main grider.4. Using Midas/civil to establish the full three-dimensional bridge model and obtained the temperature effect:temperature gradient of main beam has the biggest impact, the second is temperature gradient between cables, beam and pylons,the last is the system gradient.